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VANADIUM DIOXIDE BASED FABRY-PEROT EMITTER FOR DYNAMIC RADIATIVE COOLING APPLICATIONS

Sydney Taylor
Arizona State University 464 E Tyler Mall, Tempe, AZ 85287 USA

Yue Yang
Arizona State University, Tempe, AZ 85287 USA

Liping Wang
George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology, Atlanta, GA 30332, USA; Arizona State University Tempe, AZ 85287 USA

Abstract

An asymmetric Fabry-Perot emitter is proposed with a lossless dielectric spacer sandwiched between a vanadium dioxide (VO2) thin film and an opaque aluminum substrate. Switchable mid-infrared emittance has been achieved due to the insulator-to-metal transition of VO2. When VO2 is dielectric below 341 K, the structure is highly reflective, whereas a Fabry-Perot resonance cavity is formed with high broadband emissivity at 10 μm when VO2 becomes metallic above 345 K. The radiative properties are calculated via a uniaxial transfer matrix method and Bruggeman effective medium theory. This study will facilitate novel applications in building and spacecraft radiative cooling.

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